lpcdecode.h

PA1688网络电话机全部源程序

    
   /****************************************************************** 
    
       iLBC Speech Coder ANSI-C Source Code 
    
       LPC_decode.h      
    
       Copyright (c) 2001, 
       Global IP Sound AB. 
       All rights reserved. 
    
   ******************************************************************/ 
    
   #ifndef __iLBC_LPC_DECODE_H 
   #define __iLBC_LPC_DECODE_H 
    
   void LSFinterpolate2a_dec(  
       float *a,           /* (o) lpc coefficients for a sub frame */ 
       float *lsf1,    /* (i) first lsf coefficient vector */ 
       float *lsf2,    /* (i) second lsf coefficient vector */ 
       float coef,         /* (i) interpolation weight */ 
       int length          /* (i) length of lsf vectors */ 
   ); 
          
   void SimplelsfDEQ(  
       float *lsfdeq,      /* (o) dequantized lsf coefficients */ 
       int *index,         /* (i) quantization index */ 
       int lpc_n           /* (i) number of LPCs */ 
   ); 
    
   void DecoderInterpolateLSF(  
       float *syntdenum,   /* (o) synthesis filter coefficients */ 
       float *weightdenum, /* (o) weighting denumerator  
     
    
    
                                  coefficients */ 
       float *lsfdeq,      /* (i) dequantized lsf coefficients */ 
       int length,         /* (i) length of lsf coefficient vector */ 
       iLBC_Dec_Inst_t *iLBCdec_inst  
                           /* (i) the decoder state structure */ 
   ); 
    
   #endif